When adding any suffix to the word "panic," a "k" is added after the "c". Examples: panicked, panicking, panicky.

Why is this the case? Are there any other English words that do the same? I'm also curious about any other words that add extra or unexpected letters when part of speech or tense changes.

The etymology of "panic" includes a Greek origin--"panikon"--which is spelled with a "k" but no "c". Does this origin have anything to do with adding the "k" in variations of "panic"? But still, why keep both the "c" and the "k" in these variations? I know many other English words use "c" and "k" together (stick, lock, back, truck), but these others consistently use "ck" in all forms ("stick," "sticky," "stuck").

As this 1714 "dictionary" shows, panick was once a perfectly acceptable spelling. It's just that we've standardised on not including the "k" in modern spelling for that particular word. Which, like plasticky, happens to be a noun we sometimes want to convert to an adjective. If we didn't add [back] the "k", it would suggest a soft "c" rather than a hard one.
– FumbleFingersMar 13 '13 at 16:39

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...I'm no scholar of Ancient Greeks, but I'm not sure they even had a letter "c". We habitually convert their "k" to our "c" in anglicised forms.
– FumbleFingersMar 13 '13 at 16:43

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I hadn't thought about "plasticky". I'm a terrible speller, but even I would have recognized that "plasticy" doesn't look right without the "k." Also, thanks for giving me a rule that applies here: the addition of "k" after "c" makes the hard "c" sound. I really don't know all the spelling rules very well. I vaguely recall learning some spelling rules in 2nd grade, but I didn't pay much attention then. Now I have to go back and learn all that stuff!
– LizPMar 13 '13 at 16:47

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Often one does things one way because to do them another way would be something different. If you spelled it 'panicy', you'd want to pronounce it like 'panissy', which is not how you actually pronounce the adjective form of 'panic'. So we spell it another way that emphasizes the 'k' like sounding that we expect.
– MitchMar 13 '13 at 18:14

(2) before e, i, y, it has the ‘soft’ sound [s]. In all words from Old English or Old French, final c is avoided: the [k] sound being written k or ck, as in beak, meek, oak, book, bark, balk, bank, pack, peck, pick, rock. This is probably due to the claims of derivatives like meeker, oaken, barking, rocky, where c could not be used. Final c however is written in modern words from Latin, Greek, or other languages, and (of late) in the ending -ic, as in sac, tic, epic, critic, music, picnic. In the rare cases in which this c is followed in inflexion by e or i, it is necessary to change it to ck, as in physicking, mimicking, frolicking, trafficker, picnicker. When the [s] sound is final, it must be written ‑ce, as in trace, ice, thrice, and this final e must be retained in composition before a, o, u, as in trace-able, peace-able.

(3) Ci (rarely ce) preceding another vowel has frequently the sound of [ʃ], esp. in the endings ‑cious, ‑cial, ‑cion, as atrocious, glacial, coercion (ocean). This sound (which is also taken by t in the same position) has been developed in comparatively modern times by palatalization of [s]. In a few words from foreign languages, c retains the foreign pronunciation, as in It. cicerone[tʃitʃeˈrone].

Yes, you will sometimes see words like those misspelled without the protective k, but that’s like spelling the plural of bunny as *bunnys instead of as bunnies: it’s just plain wrong. We do not do things that way in English.

Notice the 'scare quotes' around 'soft' and 'hard'; these are not good terms because nothing is either softer or harder about the consonants /s/ and /k/. /s/ is a sibilant and /k/ is a stop; those are the non-scare, or correct terms. Of course, English speakers are mostly too scared to use correct terminology; what would people think of them? The terms they learned in grammar school are much more comfortable. Sigh
– John LawlerMar 13 '13 at 20:54

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@John, John, John: well do I know that. But it is not up to me to edit my citations. At least they scarequoted them.
– tchrist♦Mar 13 '13 at 20:55

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Even if you personally dislike these terms, it's common to refer to "soft" and "hard" c's and g's. It's reasonably clear which sounds are met and when discussing orthography, it allows use to use the same terminology to refer to the alternate pronunciations of both of these letters which pattern in similar ways. I'm all in favor of teaching people more linguistic terminology, but I don't see any reason to criticize the use of grammar school terminology when it effectively communicates a concept.
– sumelicDec 29 '14 at 7:58

Your penultimate sentence rather overstates things. There are an awful lot of words ending in -ic, for example, that are pronounced with a hard "c" but don't need a "k". In modern spelling, at least - in most cases if you add a "k" it just looks Victorian or earlier.
– FumbleFingersMar 13 '13 at 17:02

@FumbleFingers hmmm, i couldnt think of any when i wrote it, any examples?
– RhysWMar 13 '13 at 20:45

Actually, "racy" is not a good example since the root word "race" has a soft "c" sound (easy to figure out - it's followed by a vowel), so to make it an adjective, the "e" is dropped and the "y" is added - but it retains it soft "c" sound.
– Kristina LopezMar 13 '13 at 20:52

@RhysW: Sorry - I think I misread your meaning. My meaning was that lots of words end in -ic rather than -ick. And apparently the only way you're going to know whether you need that "k" as the last letter is to know the etymology. Which is pretty useless for most of us most of the time, because we'll only know the etymology by looking it up, in which case we're already looking at the correct spelling!
– FumbleFingersMar 13 '13 at 21:59

@KristinaLopez that was sort of my point though, if a c is followed by a vowel or y its a soft c. which is why the K needs to be added for the other versions of the word or it loses the hard sound
– RhysWMar 14 '13 at 10:20

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